Abnormal brain responses to hunger in patients with anorexia

Abnormal brain responses to hunger in patients with anorexia
Abnormal brain responses to hunger in patients with anorexia

HealthDay News — Patients diagnosed with anorexia nervosa have an abnormal brain response to hunger signals, according to study findings published in Biological Psychiatry.

"When most people are hungry, they are motivated to eat," said Christina Wierenga, PhD, an associate professor of psychiatry at the University of California San Diego School of Medicine, said in a university news release.

 "Yet individuals with anorexia can be hungry and still restrict their food intake. We wanted to identify brain mechanisms that may contribute to their ability to ignore rewards, like food," she explained.

To investigate brain response to rewards during hunger and satiated states to examine whether diminished response to reward could underlie food restriction in anorexia nervosa,  the scientists followed 23 women who had recovered from anorexia and 17 healthy women who had never had the disorder.

The patients who recovered from anorexia "showed decreased response to reward, even when hungry. This is opposite of healthy women without an eating disorder, who showed greater sensitivity to rewards when hungry," noted Wierenga.

"Our study suggests that brain circuitry differences in anorexics make them less sensitive to reward and the motivational drive of hunger. Put another way, hunger does not motivate them to eat," said Walter Kaye, MD, director of the Eating Disorders Treatment and Research Program at the university, said in the news release.

There were differences in areas of the brain that are important for self-control in those who had recovered from anorexia. That means people with anorexia may have greater self-control than people who don't have the eating disorder, according to Kaye.

References

  1. Wierenga CE et al. Biological Psychiatry. 2015; doi:  http://dx.doi.org/10.1016/j.biopsych.2014.09.024
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